Great as a base layer but also great for a cool day, not cold, worn all by itself. The comfort is great and there is absolutely no restriction in movement with this material. I highly recommend.

Comfortable, warm, and did a moderately good job of taming my gamey smell after sweating all day long.

This is a great base layer for active fall and moderately cool winter days. It does a great job wicking moisture and is fairly comfortable for a synthetic shirt. I've used for a skiing base layer and as the only layer running and it works well. The eXtend mid-weight is a little heavier, and that works very well for the colder days.

My featherweight is like another skin. I wear it all day every day and never notice it, just like my own skin. It is the perfect first layer indoors or out. I bought it for biking but wear it all the time because it just keeps me comfortable every where I go. Get into it 'cause you'll love it too...